[FFmpeg-devel] [PATCH 2/2] avcodec/pcm: Fix invalid shift in AV_CODEC_ID_PCM_LXF

[Paul B Mahol]

probably ok

On 2/21/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: left shift of 233 by 24 places cannot be represented in type 'int'
> Fixes:
> 20736/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PCM_LXF_fuzzer-4829212685107200
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/pcm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
> index 6346510de0..96a68f7fe8 100644
> --- a/libavcodec/pcm.c
> +++ b/libavcodec/pcm.c
> @@ -513,7 +513,7 @@ static int pcm_decode_frame(AVCodecContext *avctx, void
> *data,
>                                   ((src[2] & 0x0F) <<  8) |
>                                     src[1];
>                  // extract high 20 bits and expand to 32 bits
> -                *dst_int32_t++ =  (src[4]         << 24) |
> +                *dst_int32_t++ =  ((uint32_t)src[4]<<24) |
>                                    (src[3]         << 16) |
>                                   ((src[2] & 0xF0) <<  8) |
>                                    (src[4]         <<  4) |
> --
> 2.17.1
>
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